swing - Java - JScrollPane with JTable not shown -

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i have jpanel add jscrollpane (see class below). added jtextfield verify works (instead of jscrollpane) , text field added panel. when try add jscrollpane nothing (white background) shown. how can fix that?

protected jpanel createcontentpanel() {     jpanel panel = new jpanel();     panel.setlayout(new borderlayout());      final string[] columnnames = { "test1", "test2", "test3" };     final string[][] data = {             { "foo1", "foo2", "foo3" },             { "bar1", "bar2", "bar3" },             { "bar1", "bar2", "bar3" },             { "bar1", "bar2", "bar3" },             { "bar1", "bar2", "bar3" },             { "bar1", "bar2", "bar3" },             { "bar1", "bar2", "bar3" },             { "bar1", "bar2", "bar3" }     };      scrollabletable scrollabletablepane = new scrollabletable(data, columnnames);     panel.add(scrollabletablepane, borderlayout.center);     return panel; }   public class scrollabletable extends jscrollpane {      public scrollabletable(string[][] adata, string[] acolumnnames) {         super();          tablemodel model = gettablemodel(adata, acolumnnames);         jtable overviewtable = new jtable(model);         overviewtable.setgridcolor(new color(240, 240, 240));         tablerowsorter<tablemodel> sorter = new tablerowsorter<tablemodel>(model);         overviewtable.setrowsorter(sorter);          this.add(overviewtable);     }      private tablemodel gettablemodel(string[][] adata, string[] acolumnnames) {         tablemodel model = new defaulttablemodel(adata, acolumnnames) {             public class<?> getcolumnclass(int column) {                 return getvalueat(0, column).getclass();             }         };         return model;     } }

to set displayed component of jscrollpane, use jscrollpane#setviewportview(component) rather add(component).

public scrollabletable(string[][] adata, string[] acolumnnames) {     super();      tablemodel model = gettablemodel(adata, acolumnnames);     jtable overviewtable = new jtable(model);     overviewtable.setgridcolor(new color(240, 240, 240));     tablerowsorter<tablemodel> sorter = new tablerowsorter<tablemodel>(model);     overviewtable.setrowsorter(sorter);      this.setviewportview(overviewtable); }

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